All aluminum pistons are "cam" ground, meaning egg shaped. Being smaller across on pin side than thrust side. Also, tapered from bottom to top on thrust sides of piston. You measure just below the bottom ring groove on the skirt, and bottom of skirt to determine how much taper. Usually about .002 to .003 depending on size of piston. The ring lands them selves will be much less diameter and probably vary from one ring land to the next. Reminds me of a point one of IH super salesman brought up at a meeting many years ago. He was pointing out that IH pistons were cam ground ( which he had never heard of before and didn't know what it meant). He was using this as a selling point over the competitors. I told him we cam ground pistons in 1955 at school on any and all aluminum pistons. Then another time when a John Deere mechanic was pointing out to me that the new Deere diesels used a keystone (tapered ring land) and I tried to convince him IH and other mfg's had been using it for several years. Most mfg's use very similar style pistons and rings.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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